I'm not a vendor in the truest sense of the word, as I didn't make this app and nor do I get anything if you buy it. But I feel like I should tell you about it because a friend of mine wrote it just for me.
It's called Par Timer and all it's for is doing dryfire drills with par times. I wanted an app that's super simple to use with no frills so I could burn through tons of dryfire reps. I made sure the entire screen was the start/stop button so I wouldn't have to look for a tiny ass button to start reps, and I had him put the real range commands on there to make it line up with real stages.
I've been using the hell out of this app running my dryfire sessions. I'd like you guys to try it out and tell me what you think. I'm very good friends with the guy who made it and would be more than willing to pass along the feedback. My idea now is to give the app a way to replace the dryfire notebook -- give me a chart or something where I can keep track of my current par times across different drills. Let me know any other ideas you have.